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Catalytic Effects of CeO2/Fe2O3 and Inherent Mineral Matter on Anthracite Combustion Reactions and Its Kinetic Analysis
- Gong, Xuzhong, Zhang, Shu
- Energy & Fuels 2017 v.31 no.11 pp. 12867-12874
- activation energy, aluminum oxide, catalysts, catalytic activity, ceric oxide, combustion, ferric oxide, fuels, kinetics, models, thermal analysis
- Effects of external and internal catalysts on anthracite combustion reactivity and kinetics were investigated using the method of differential thermal analysis (DTA). It was found that the combustion reactivity of both raw and demineralized anthracites was all apparently improved by the introduction of CeO₂ and Fe₂O₃. When CeO₂ and Fe₂O₃ were used in raw anthracite, the combustion starting time from the DTA curve was advanced from 1470 to 1312 and 1325 s, respectively, as compared to the improvements from 1285 to 1089 and 1055 s while adding the same amounts of CeO₂ and Fe₂O₃ into demineralized anthracite. The addition of catalysts has increased the combustion rate for raw anthracite much more significantly than that for demineralized anthracite. Reformed differential thermal analysis (RDTA, change the reference material from Al₂O₃ to raw anthracite) showed a direct effect of catalysts on its combustion, which broadly agreed with the results of the DTA study. The inherent mineral matter at high contents could potentially prevent the catalytic activity of CeO₂. The kinetic study has demonstrated that the combustion reactions of all samples could see the two-stage scheme phenomena with different values of apparent activation energy and different fitting models. The addition of CeO₂ and Fe₂O₃ has reduced the activation energy for demineralized anthracite more than that for raw anthracite.